#VU63727 Insufficient verification of data authenticity in AMD products - CVE-2021-26317

Vulnerability identifier: #VU63727

Vulnerability risk: Low

CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2021-26317

CWE-ID: CWE-345

Exploitation vector: Local access

Exploit availability: No public exploit available

Vulnerable software:
AMD Ryzen 2000 series Desktop processor
AMD Ryzen 3000 Series Desktop processor
AMD Ryzen 5000 Series Desktop processor with Radeon graphics
2nd Gen AMD Ryzen Threadripper processors
3rd Gen AMD Ryzen Threadripper processors
AMD Ryzen Threadripper PRO processors
AMD Ryzen 2000 Series Mobile processor
AMD Ryzen 3000 Series Mobile processor
2nd Gen AMD Ryzen Mobile processor with Radeon graphics
AMD Athlon 3000 Series Mobile processors with Radeon Graphics
AMD Ryzen 3000 Series Mobile processor with Radeon graphics
AMD Ryzen 5000 Series Mobile processor with Radeon graphics

Software vendor:
AMD

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to failure to verify the protocol in AMD System Management Mode (SMM). A local user can modify SPI flash and execute arbitrary code with elevated privileges.

Install updates from vendor's website.

• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027